Heater



FIG. 1 is an isometric view of the heater showing my new design.

FIG. 2 is a side elevation view of the heater showing my new design.

FIG. 3 is a front elevation view of the heater showing my new design.

FIG. 4 is a top plane view of the heater showing my new design; and,

FIG. 5 is a rear elevation view of the heater showing my new design. 

The ornamental design for a heater, as shown and described. 